# US 11,309,371 B2 · Display substrate, method for manufacturing the same, and display device

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- Number: US 11,309,371 B2
- Document ID: US11309371B2
- Status: Granted
- Kind: B2
- Application number: 15/931,151
- Filed: 2020-05-13
- Published: 2021-03-25
- Granted: 2022-04-19
- Earliest claimed: 2019-09-19
- Assignees: Chongqing BOE Display Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Chongqing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Yongmin Liang; Yueyuan Jian
- Web page: https://patentgrep.com/patent/US11309371B2

## CPC

- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 59/124: Insulating layers formed between TFT elements and OLED elements
- H10K 59/873: {Encapsulations}
- H10K 71/166: {using selective deposition, e.g. using a mask}
- H10K 59/1201: {Manufacture or treatment}
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 71/164: {using vacuum deposition}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display substrate, a method for manufacturing the same and a display device are provided. The method for manufacturing the display substrate includes: forming a control structure layer on a base substrate; forming a first planarization layer on the control structure layer; forming a support structure on the first planarization layer, a material of the support structure includes a negative photosensitive polymer; forming a protection layer enveloping the support structure on the first planarization layer formed with the support structure; forming a second planarization layer on the protection layer; and forming a first electrode on the second planarization layer, the first electrode is electrically connected to the control structure layer.

## Claims

### Claim 1

A method for manufacturing a display substrate, comprising:
forming a control structure layer on a base substrate;
forming a first planarization layer on the control structure layer;
forming a support structure on the first planarization layer, wherein a material of the support structure comprises a negative photosensitive polymer;
forming a protection layer enveloping the support structure on the first planarization layer formed with the support structure;
forming a second planarization layer on the protection layer; and
forming a first electrode on the second planarization layer, wherein the first electrode is electrically connected to the control structure layer.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the forming the control structure layer on the base substrate comprises:
forming an active layer and a gate electrode on the base substrate;
forming a third insulation layer on the base substrate formed with the active layer and the gate electrode, wherein a first via hole and a second via hole are formed in the third insulation layer; and
forming a source electrode and a drain electrode on the third insulation layer, wherein the source electrode and the drain electrode are electrically connected to the active layer through the first via hole and the second via hole respectively.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the forming the second planarization layer on the protection layer comprises:
forming an intermediate metal layer on the protection layer, wherein the intermediate metal layer is electrically connected to the control structure layer by penetrating the protection layer and the first planarization layer; and
forming the second planarization layer on the base substrate formed with the intermediate metal layer, wherein a fourth via hole revealing the intermediate metal layer is formed in the second planarization layer, and the first electrode is electrically connected to the intermediate metal layer through the fourth via hole.

### Claim 4 (depends on 1)

The method according to claim 1, wherein a material of the first planarization layer comprises a positive polyimide.

### Claim 5 (depends on 1)

The method according to claim 1, further comprising:
forming a pixel definition layer on the first electrode, wherein the pixel definition layer is provided with a sub-pixel opening revealing the first electrode; and
forming a light-emitting layer in the sub-pixel opening.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the protection layer is made of silicon nitride, silicon oxide, or a composite of silicon nitride/silicon oxide.

### Claim 7

A display substrate, comprising:
a base substrate,
a control structure layer disposed on the base substrate;
a first planarization layer disposed on the control structure layer;
a support structure disposed on the first planarization layer, wherein a material of the support structure comprises a negative photosensitive polymer;
a protection layer disposed on the first planarization layer formed with the support structure, wherein the protection layer covers the support structure;
a second planarization layer disposed on the protection layer; and
a first electrode disposed on the second planarization layer, wherein the first electrode is electrically connected to the control structure layer.

### Claim 8 (depends on 7)

The display substrate according to claim 7, wherein a cross-section of the support structure in a direction perpendicular to the base substrate is of an inverted trapezoid shape, and a width of a top edge of the support structure that is away from the base substrate is larger than a width of a bottom edge of the support structure that is toward the base substrate.

### Claim 9 (depends on 8)

The display substrate according to claim 8, wherein an angle between a side surface of the support structure and a bottom surface of the support structure that is toward the base substrate ranges from 90° to 130°.

### Claim 10 (depends on 7)

The display substrate according to claim 7, wherein a size of the support structure in a direction perpendicular to the base substrate ranges from 1.0 μm to 1.5 μm.

### Claim 11 (depends on 7)

The display substrate according to claim 7, wherein a thickness of the protection layer ranges from 3000 angstroms to 5000 angstroms.

### Claim 12 (depends on 7)

The display substrate according to claim 7, wherein a material of the first planarization layer comprises a positive polyimide.

### Claim 13 (depends on 7)

The display substrate according to claim 7, further comprising an intermediate metal layer disposed between the protection layer and the second planarization layer, wherein the intermediate metal layer is electrically connected to the control structure layer by penetrating the protection layer and the first planarization layer, and the first electrode is electrically connected to the intermediate metal layer by penetrating the second planarization layer.

### Claim 14 (depends on 7)

The display substrate according to claim 7, further comprising a pixel definition layer disposed on the first electrode, wherein the pixel definition layer is provided with a sub-pixel opening revealing the first electrode, and a light-emitting layer is disposed in the sub-pixel opening.

### Claim 15 (depends on 7)

The display substrate according to claim 7, further comprising a plurality of pixel units arranged in an array comprising rows and columns, wherein each of the plurality of pixel units comprises a plurality of sub-pixels, and the support structure is disposed between two adjacent pixel units.

### Claim 16 (depends on 15)

The display substrate according to claim 15, wherein the support structure is a strip-shaped structure and is disposed between two adjacent columns or rows of pixel units.

### Claim 17 (depends on 15)

The display substrate according to claim 15, wherein the support structure comprises a plurality of support pillars sequentially disposed in equal distance from one another, the support structure is disposed between two adjacent columns or rows of pixel units, and each of the plurality of support pillars is disposed between two adjacent pixel units.

### Claim 18 (depends on 7)

A display device, comprising the display substrate according to claim 7.